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首页> 外文期刊>Corrosion Engineering, Science and Technology >Erosion corrosion properties of HVOF coatings for municipal solid waste incinerator protection
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Erosion corrosion properties of HVOF coatings for municipal solid waste incinerator protection

机译：用于城市生活垃圾焚烧炉的HVOF涂料的冲蚀腐蚀性能

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摘要

Municipal solid waste incinerators (MSWI) usually have erosion-corrosion (EC) problems. A possible solution for the damage caused by EC processes in the heat exchanger zone has been found in thermal spray coatings with Ni based and Fe based high velocity oxygen fuel (HVOF) coatings showing promising results. High velocity oxygen fuel coatings generally have a low porosity and good adherence. These properties help to prevent damage to exchanger tubes. In the present paper Ni and Fe alloys were compared under different laboratory tests and in service inside a MSWI heat exchanger. Coatings were also characterised by standardised tribological and microhardness tests. A eutectic mixture of KCl-ZnCl2 found on the boiler ashes was used as a corrosion agent in the laboratory tests. Scanning electron microscopy (SEM) images of sprayed coating structures before and after the tests were compared. Energy dispersive spectroscopy (EDS) analysis and X-ray diffraction (XRD) were used to characterise the coatings and corrosion products. Studies on bulk materials with similar composition help to understand some steps in the corrosion processes that take place during incineration. It is concluded that the low level of protection provided by Fe based alloy HVOF coating in these conditions may be attributed to the role of non-protective chromium oxides, and the good behaviour of Ni based alloy HVOF coating may be attributed to the formation of more protective Ni, Mo and Nb oxides.
机译：市政固体废物焚化炉（MSWI）通常存在侵蚀腐蚀（EC）问题。在具有镍基和铁基高速氧燃料（HVOF）涂层的热喷涂涂层中，发现了解决换热区EC工艺造成的损坏的可能解决方案，并显示出令人鼓舞的结果。高速氧气燃料涂层通常具有低孔隙率和良好的粘附性。这些特性有助于防止损坏交换管。在本文中，比较了镍和铁合金在不同的实验室测试中以及在MSWI热交换器内部使用中的情况。涂层还通过标准化的摩擦学和显微硬度测试来表征。在实验室测试中，将锅炉灰烬上发现的KCl-ZnCl2的低共熔混合物用作腐蚀剂。比较了测试前后喷涂涂层结构的扫描电子显微镜（SEM）图像。能量色散光谱（EDS）分析和X射线衍射（XRD）用于表征涂层和腐蚀产物。对具有相似成分的散装材料的研究有助于了解焚化过程中发生的腐蚀过程中的某些步骤。结论是，在这些条件下，铁基合金HVOF涂层提供的低保护水平可能归因于非保护性氧化铬的作用，而镍基合金HVOF涂层的良好性能则可能归因于更多的形成。保护性的Ni，Mo和Nb氧化物。

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